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| Ernest I of Brunswick-Grubenhagen | |
|---|---|
| Born | c. 1297 |
| Died | 9 March 1361 |
| Spouse | Adelheid of Everstein-Polle |
| Issue | Albert I Adelheid Agnes Anna Frederick I |
| House | House of Guelph |
| Father | Henry I, Duke of Brunswick-Grubenhagen |
| Mother | Countess Agnes of Meissen |
Ernest I of Brunswick-Grubenhagen (German: Ernst I., Fürst von Braunschweig-Grubenhagen; c. 1297 – 9 March 1361) was Prince of Brunswick-Grubenhagen.